Bottom left is Sara Cox. A Radio 2 DJ. She used to live on a farm behind my old school, rode her horse around the village, and went to school with my older sister.

When my sister got to play for England's Women Rugby team, she rang Sara Cox on the radio and asked her "Do you remember me, from school?"
.. At which point, Sara completely leathered into my sister, calling her out as the school bully, and having made her life hell.
My sister didn't find it anywhere near as funny as the rest of us did.

I used to have an MP3 of that, but .. No idea where it's gone. It's gotten lost over the years.

I'd heard originally there was to be a series with David Tennant as host, hence the opening gag about "the guy who used to be the Doctor."
No idea if that's still happening, but it'll be pretty disappointing if they continue to use these tiny sets!

Fwiw, the tiny sets were provided by the actual "you can go and play it" Crystal Maze Event thingy.. I think it's in London, or something.

The puzzles were old for the same reason the set was small. They filmed it at a 'Crystal Maze Experience' place, where you can book events such as birthday/stag parties etc.
I really doubt they kept the real set up for twenty years unused.